 & Control & Treatment & Difference \\ \hline 
  Site establishment year & 2009.13 & 2010.57 & 1.44 \\ 
 & (6.17) & (6.50) & (1.86)\\ 
  Venting & 29.35 & 120.90 & 91.55 \\ 
 & (89.00) & (398.59) & (50.83)\\ 
  Gas production & 170.71 & 197.87 & 27.16 \\ 
 & (285.27) & (590.38) & (137.00)\\ 
  Oil production & 46.57 & 34.08 & -12.49 \\ 
 & (97.44) & (81.70) & (31.68)\\ 
 \hline 
N: & 16 & 36 & \\
